a soldering problem? I think maybe not, you have soldered before and it isn’t hard to do. it wouldn’t harm it to run the solder over the pins again.
I’m at a loss as to why you are having issues.
You could try and power off the GSM module to see if it makes a difference.
echo -e "AT+CPWROFF\r\n" > /dev/ttyACM0
Have you tried assisted GPS? and see if it maintains a fix?
https://ozzmaker.com/get-a-gps-fix-in-seconds-using-assisted-gps-on-a-raspberry-pi-with-a-berrygps-gsm/
You could also try to use U-Center to get more verbose information to help with troubleshooting.
https://ozzmaker.com/using-u-center-to-connect-to-a-raspberry-pi-with-an-attached-berrygps-imu-gsm/
We may have to send you a new one.
I still see 3 on Amazon.com
https://www.amazon.com/BerryGPS-GSM-Global-Cellular-Modem-GPS/dp/B07TNS2MHW
Amazon is USD and OzzMaker.com is AUD. After conversation, Amazon is more expensive. This is because Amazon charges a lot of fees. But the benefit is that you get it a lot quicker.
We were working on a LTE version.. but that has been put on hold because of COVID-19. We will start on it again soon.
Mark --OzzMaker.com --
